Question

name: read each question carefully, and decide which is the best answer. fill in the bubble with the letter of the correct answer on your answer sheet. 1. what type of energy is generated when people rub their hands together? a. chemical b. heat c. light d. mechanical 2. a student is studying types of energy by rolling a marble down a ramp as shown in the image below. marble direction of movement ramp at which point is the stored energy of the marble the greatest? a. when the marble starts rolling down the ramp b. when the marble reaches the bottom of the ramp c. when the marble reaches the middle of the ramp d. when the marble is resting at the top of the ramp 3. which of the following is not an example of energy transformation? a. a fireplace burning wood for a fire b. a solar cell using light for electricity c. the gasoline in a car making the engine run d. the ink in a pen making a stain when it leaks date:

Explanation:

1. When people rub their hands together, friction generates heat energy.
2. Stored energy (potential energy) of the marble is greatest at the highest - point. At the top of the ramp, it has maximum gravitational potential energy.
3. Energy transformation involves conversion of one form of energy to another. Ink leaking from a pen to make a stain is not an energy - transformation process.

Answer:

1. B. heat
2. D. when the marble is resting at the top of the ramp
3. D. the ink in a pen making a stain when it leaks